Don't forget Ruger's little semi auto .22 from way back.........a time-tested pistol that didn't make the list probably because, well, it's a .22.
But it was a good design that is still going strong.
I do think they nailed the #1 spot with the 1911.......everything else is....well.....following the leader.............

Thing is Peg, there really isn't anything innovative with the Mk I RugerThe Colt Woodsman and High Standard Supermatic were both out long before that.
I think the list shows too much of a USA slant.
No Luger, P-38, or one I expected to be number 2, CZ-75.
No S&W model 3, which sold more than the SAA.
Maybe it's too modern, but how about a Ruger Mark .22?
Again, the only ones that you mention that were "Innovative" were the Luger, which was developed from the Borchardt, the only "NEW" thing about it was the toggle actoin which as far as I know was never again used on a pistol, in fact the Luger clones made in Sweden and Finland, the Lahti, didn't use Georg's toggle action.
The P-38 was the first double action Semi auto adopted by a large Army, but it grew out of the PPK development (which WAS listed).
As to the S&W #3 if sales numbers were a criterion for the list the Volcanic NEVER would have made it
Actually the list, now that I look it over critically, is crap because of ONE OMISSION .
I'll leave it at that as a trivia question.
The person who figures out the most important pistol left off the list gets my congratulations